Mornings  guys - 

1 have 4 of pylontech  us2000b 

My brother  has 2  Hauwei (ESM-48100A1) 

Any 1 know if its  possible  to   connect  pylon and Huawei  batteries  in parallel  on 1 system  -   

Thanks 

No, I dont know the Huawei at all, or any of it's values, but the Pylontech BMS will complain about something.

Im to scared  to take  the chance -

Pylontech is LFP 15 cells connected in series.

Check the chemistry and number of cells in that Huawei battery pack. I bet that it will be 16 cells. If that's the case, then these two batteries cannot be connected in parallel.